#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
int main()
{
	int a = 2, b = 1;
	printf("a=%d,b=%d\n", a, b);
	a = a ^ b;
	b = a ^ b;
	a = a ^ b;
	printf("a=%d,b=%d\n", a, b);
}